83 lines
1.3 KiB
C
83 lines
1.3 KiB
C
#include <stdint.h>
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#include <string.h>
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#ifdef _WIN32
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# include <memoryapi.h>
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# include <sysinfoapi.h>
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#else
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# include <sys/mman.h>
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# include <unistd.h>
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#endif
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#include "jit.h"
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static size_t page_size = 0;
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JitBuffer *
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jit_buffer_new(void)
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{
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#ifdef _WIN32
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DWORD type;
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DWORD prot;
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SYSTEM_INFO sysinfo;
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if (page_size == 0)
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{
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GetSystemInfo(&sysinfo);
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page_size = sysinfo.dwPageSize;
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}
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type = MEM_RESERVE | MEM_COMMIT;
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prot = PAGE_READWRITE;
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return (VirtualAlloc(NULL, page_size, type, prot));
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#else
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int prot;
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int flags;
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if (page_size == 0)
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{
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page_size = sysconf(_SC_PAGESIZE);
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}
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prot = PROT_READ | PROT_WRITE;
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flags = MAP_ANONYMOUS | MAP_PRIVATE;
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return (mmap(NULL, page_size, prot, flags, -1, 0));
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#endif
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}
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void
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jit_buffer_finalize(JitBuffer *buff)
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{
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#ifdef _WIN32
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DWORD old;
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VirtualProtect(buff, page_size, PAGE_EXECUTE_READ, &old);
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#else
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mprotect(buff, page_size, PROT_READ | PROT_EXEC);
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#endif
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}
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void
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jit_buffer_add(JitBuffer *buff, int size, void *value)
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{
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memcpy(buff->code + buff->count, value, size);
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buff->count += size;
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}
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void
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jit_buffer_execute(JitBuffer *buff)
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{
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}
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void
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jit_buffer_destroy(JitBuffer *buff)
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{
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#ifdef _WIN32
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VirtualFree(buff, page_size, MEM_RELEASE);
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#else
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munmap(buff, page_size);
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#endif
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}
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